1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 1994-1996 Søren Schmidt 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 #include <sys/param.h> 31 #include <sys/signal.h> 32 #include <x86/specialreg.h> 33 #include <x86/trap.h> 34 #include <x86/x86_var.h> 35 36 #include <x86/linux/linux_x86.h> 37 38 #define LINUX_T_UNKNOWN 255 39 static int _bsd_to_linux_trapcode[] = { 40 LINUX_T_UNKNOWN, /* 0 */ 41 6, /* 1 T_PRIVINFLT */ 42 LINUX_T_UNKNOWN, /* 2 */ 43 3, /* 3 T_BPTFLT */ 44 LINUX_T_UNKNOWN, /* 4 */ 45 LINUX_T_UNKNOWN, /* 5 */ 46 16, /* 6 T_ARITHTRAP */ 47 254, /* 7 T_ASTFLT */ 48 LINUX_T_UNKNOWN, /* 8 */ 49 13, /* 9 T_PROTFLT */ 50 1, /* 10 T_TRCTRAP */ 51 LINUX_T_UNKNOWN, /* 11 */ 52 14, /* 12 T_PAGEFLT */ 53 LINUX_T_UNKNOWN, /* 13 */ 54 17, /* 14 T_ALIGNFLT */ 55 LINUX_T_UNKNOWN, /* 15 */ 56 LINUX_T_UNKNOWN, /* 16 */ 57 LINUX_T_UNKNOWN, /* 17 */ 58 0, /* 18 T_DIVIDE */ 59 2, /* 19 T_NMI */ 60 4, /* 20 T_OFLOW */ 61 5, /* 21 T_BOUND */ 62 7, /* 22 T_DNA */ 63 8, /* 23 T_DOUBLEFLT */ 64 9, /* 24 T_FPOPFLT */ 65 10, /* 25 T_TSSFLT */ 66 11, /* 26 T_SEGNPFLT */ 67 12, /* 27 T_STKFLT */ 68 18, /* 28 T_MCHK */ 69 19, /* 29 T_XMMFLT */ 70 15 /* 30 T_RESERVED */ 71 }; 72 73 /* 74 * If FreeBSD & Linux have a difference of opinion about what a trap 75 * means, deal with it here. 76 */ 77 int 78 linux_translate_traps(int signal, int trap_code) 79 { 80 if (signal != SIGBUS) 81 return (signal); 82 switch (trap_code) { 83 case T_PROTFLT: 84 case T_TSSFLT: 85 case T_DOUBLEFLT: 86 case T_PAGEFLT: 87 return (SIGSEGV); 88 default: 89 return (signal); 90 } 91 } 92 93 int 94 bsd_to_linux_trapcode(int code) 95 { 96 97 return (code < nitems(_bsd_to_linux_trapcode) ? 98 _bsd_to_linux_trapcode[code] : LINUX_T_UNKNOWN); 99 } 100 101 u_int 102 linux_x86_elf_hwcap2(void) 103 { 104 static u_int elf_hwcap2 = 0; 105 static bool elf_hwcap2_valid = false; 106 107 if (!elf_hwcap2_valid) { 108 if ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0) 109 elf_hwcap2 |= LINUX_HWCAP2_FSGSBASE; 110 elf_hwcap2_valid = true; 111 } 112 return (elf_hwcap2); 113 } 114